How did Confucianism defeat other theories and become the mainstream?

Confucianism is more open and inclusive than other theories. After hundreds of years of cleaning, Confucianism has successfully integrated the subtleties of other theories, so it is natural to assume the mainstream culture, oust hundreds of schools and respect Confucianism alone. Even if no one came forward to clarify this proposition, Confucianism had become a climate at that time, and the cultural protagonist must be Confucianism.